<!DOCTYPE html>
<html lang="zh-CN">
    <head>
        <meta charset="UTF-8" />
        <title>17_HTML5-input的range属性</title>
    </head>
    <body>
        <!-- 默认是50% -->
        <input type="range">

        <input type="range" value="80">


        <input type="range" value="80" min="1" max="100">
    </body>
</html>